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(#) Duplicate Strings

!!! WARNING: Duplicate Strings
   This is a warning.

Id
:   `DuplicateStrings`
Summary
:   Duplicate Strings
Note
:   **This issue is disabled by default**; use `--enable DuplicateStrings`
Severity
:   Warning
Category
:   Performance: Application Size
Platform
:   Android
Vendor
:   Android Open Source Project
Feedback
:   https://issuetracker.google.com/issues/new?component=192708
Since
:   3.3.0 (January 2019)
Affects
:   Resource files
Editing
:   This check can *not* run live in the IDE editor
See
:   https://developer.android.com/reference/android/widget/TextView.html#attr_android:inputType
Implementation
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-checks/src/main/java/com/android/tools/lint/checks/StringCasingDetector.kt)
Tests
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/StringCasingDetectorTest.kt)

Duplicate strings can make applications larger unnecessarily.

This lint check looks for duplicate strings, including differences for
strings where the only difference is in capitalization. Title casing and
all uppercase can all be adjusted in the layout or in code.

(##) Example

Here is an example of lint warnings produced by this check:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~text
res/values/duplicate_strings.xml:3:Warning: Duplicate string value
HELLO, used in hello_caps and hello. Use android:inputType or
android:capitalize to treat these as the same and avoid string
duplication. [DuplicateStrings]
    &lt;string name="hello"&gt;hello&lt;/string&gt;
    -----------------------------------
res/values/duplicate_strings.xml:5:Warning: Duplicate string value Hello
World, used in hello_world and title_casing_hello_world. Use
android:inputType or android:capitalize to treat these as the same and
avoid string duplication. [DuplicateStrings]
    &lt;string name="hello_world"&gt;hello world&lt;/string&gt;
    -----------------------------------------------
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Here is the source file referenced above:

`res/values/duplicate_strings.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;?xml version="1.0" encoding="utf-8"?&gt;
                &lt;resources&gt;
                    &lt;string name="hello"&gt;hello&lt;/string&gt;
                    &lt;string name="hello_caps"&gt;HELLO&lt;/string&gt;
                    &lt;string name="hello_world"&gt;hello world&lt;/string&gt;
                    &lt;string name="title_casing_hello_world"&gt;Hello World&lt;/string&gt;
                &lt;/resources&gt;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

You can also visit the
[source code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/StringCasingDetectorTest.kt)
for the unit tests for this check to see additional scenarios.

The above example was automatically extracted from the first unit test
found for this lint check, `StringCasingDetector.testDuplicateStrings`.
To report a problem with this extracted sample, visit
https://issuetracker.google.com/issues/new?component=192708.

(##) Suppressing

You can suppress false positives using one of the following mechanisms:

* Using a special `lint.xml` file in the source tree which turns off
  the check in that folder and any sub folder. A simple file might look
  like this:
  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;lint&gt;
      &lt;issue id="DuplicateStrings" severity="ignore" /&gt;
  &lt;/lint&gt;
  ```
  Instead of `ignore` you can also change the severity here, for
  example from `error` to `warning`. You can find additional
  documentation on how to filter issues by path, regular expression and
  so on
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/lintxml.md.html).

* In Gradle projects, using the DSL syntax to configure lint. For
  example, you can use something like
  ```gradle
  lintOptions {
      disable 'DuplicateStrings'
  }
  ```
  In Android projects this should be nested inside an `android { }`
  block.

* For manual invocations of `lint`, using the `--ignore` flag:
  ```
  $ lint --ignore DuplicateStrings ...`
  ```

* Last, but not least, using baselines, as discussed
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).

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